libzfs_import.c revision 272453
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21/* 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright (c) 2013 by Delphix. All rights reserved. 24 * Copyright 2014 Nexenta Systems, Inc. All rights reserved. 25 */ 26 27/* 28 * Pool import support functions. 29 * 30 * To import a pool, we rely on reading the configuration information from the 31 * ZFS label of each device. If we successfully read the label, then we 32 * organize the configuration information in the following hierarchy: 33 * 34 * pool guid -> toplevel vdev guid -> label txg 35 * 36 * Duplicate entries matching this same tuple will be discarded. Once we have 37 * examined every device, we pick the best label txg config for each toplevel 38 * vdev. We then arrange these toplevel vdevs into a complete pool config, and 39 * update any paths that have changed. Finally, we attempt to import the pool 40 * using our derived config, and record the results. 41 */ 42 43#include <ctype.h> 44#include <devid.h> 45#include <dirent.h> 46#include <errno.h> 47#include <libintl.h> 48#include <stddef.h> 49#include <stdlib.h> 50#include <string.h> 51#include <sys/stat.h> 52#include <unistd.h> 53#include <fcntl.h> 54#include <thread_pool.h> 55#include <libgeom.h> 56 57#include <sys/vdev_impl.h> 58 59#include "libzfs.h" 60#include "libzfs_impl.h" 61 62/* 63 * Intermediate structures used to gather configuration information. 64 */ 65typedef struct config_entry { 66 uint64_t ce_txg; 67 nvlist_t *ce_config; 68 struct config_entry *ce_next; 69} config_entry_t; 70 71typedef struct vdev_entry { 72 uint64_t ve_guid; 73 config_entry_t *ve_configs; 74 struct vdev_entry *ve_next; 75} vdev_entry_t; 76 77typedef struct pool_entry { 78 uint64_t pe_guid; 79 vdev_entry_t *pe_vdevs; 80 struct pool_entry *pe_next; 81} pool_entry_t; 82 83typedef struct name_entry { 84 char *ne_name; 85 uint64_t ne_guid; 86 struct name_entry *ne_next; 87} name_entry_t; 88 89typedef struct pool_list { 90 pool_entry_t *pools; 91 name_entry_t *names; 92} pool_list_t; 93 94static char * 95get_devid(const char *path) 96{ 97#ifdef have_devid 98 int fd; 99 ddi_devid_t devid; 100 char *minor, *ret; 101 102 if ((fd = open(path, O_RDONLY)) < 0) 103 return (NULL); 104 105 minor = NULL; 106 ret = NULL; 107 if (devid_get(fd, &devid) == 0) { 108 if (devid_get_minor_name(fd, &minor) == 0) 109 ret = devid_str_encode(devid, minor); 110 if (minor != NULL) 111 devid_str_free(minor); 112 devid_free(devid); 113 } 114 (void) close(fd); 115 116 return (ret); 117#else 118 return (NULL); 119#endif 120} 121 122 123/* 124 * Go through and fix up any path and/or devid information for the given vdev 125 * configuration. 126 */ 127static int 128fix_paths(nvlist_t *nv, name_entry_t *names) 129{ 130 nvlist_t **child; 131 uint_t c, children; 132 uint64_t guid; 133 name_entry_t *ne, *best; 134 char *path, *devid; 135 int matched; 136 137 if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, 138 &child, &children) == 0) { 139 for (c = 0; c < children; c++) 140 if (fix_paths(child[c], names) != 0) 141 return (-1); 142 return (0); 143 } 144 145 /* 146 * This is a leaf (file or disk) vdev. In either case, go through 147 * the name list and see if we find a matching guid. If so, replace 148 * the path and see if we can calculate a new devid. 149 * 150 * There may be multiple names associated with a particular guid, in 151 * which case we have overlapping slices or multiple paths to the same 152 * disk. If this is the case, then we want to pick the path that is 153 * the most similar to the original, where "most similar" is the number 154 * of matching characters starting from the end of the path. This will 155 * preserve slice numbers even if the disks have been reorganized, and 156 * will also catch preferred disk names if multiple paths exist. 157 */ 158 verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) == 0); 159 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) != 0) 160 path = NULL; 161 162 matched = 0; 163 best = NULL; 164 for (ne = names; ne != NULL; ne = ne->ne_next) { 165 if (ne->ne_guid == guid) { 166 const char *src, *dst; 167 int count; 168 169 if (path == NULL) { 170 best = ne; 171 break; 172 } 173 174 src = ne->ne_name + strlen(ne->ne_name) - 1; 175 dst = path + strlen(path) - 1; 176 for (count = 0; src >= ne->ne_name && dst >= path; 177 src--, dst--, count++) 178 if (*src != *dst) 179 break; 180 181 /* 182 * At this point, 'count' is the number of characters 183 * matched from the end. 184 */ 185 if (count > matched || best == NULL) { 186 best = ne; 187 matched = count; 188 } 189 } 190 } 191 192 if (best == NULL) 193 return (0); 194 195 if (nvlist_add_string(nv, ZPOOL_CONFIG_PATH, best->ne_name) != 0) 196 return (-1); 197 198 if ((devid = get_devid(best->ne_name)) == NULL) { 199 (void) nvlist_remove_all(nv, ZPOOL_CONFIG_DEVID); 200 } else { 201 if (nvlist_add_string(nv, ZPOOL_CONFIG_DEVID, devid) != 0) 202 return (-1); 203 devid_str_free(devid); 204 } 205 206 return (0); 207} 208 209/* 210 * Add the given configuration to the list of known devices. 211 */ 212static int 213add_config(libzfs_handle_t *hdl, pool_list_t *pl, const char *path, 214 nvlist_t *config) 215{ 216 uint64_t pool_guid, vdev_guid, top_guid, txg, state; 217 pool_entry_t *pe; 218 vdev_entry_t *ve; 219 config_entry_t *ce; 220 name_entry_t *ne; 221 222 /* 223 * If this is a hot spare not currently in use or level 2 cache 224 * device, add it to the list of names to translate, but don't do 225 * anything else. 226 */ 227 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE, 228 &state) == 0 && 229 (state == POOL_STATE_SPARE || state == POOL_STATE_L2CACHE) && 230 nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, &vdev_guid) == 0) { 231 if ((ne = zfs_alloc(hdl, sizeof (name_entry_t))) == NULL) 232 return (-1); 233 234 if ((ne->ne_name = zfs_strdup(hdl, path)) == NULL) { 235 free(ne); 236 return (-1); 237 } 238 ne->ne_guid = vdev_guid; 239 ne->ne_next = pl->names; 240 pl->names = ne; 241 return (0); 242 } 243 244 /* 245 * If we have a valid config but cannot read any of these fields, then 246 * it means we have a half-initialized label. In vdev_label_init() 247 * we write a label with txg == 0 so that we can identify the device 248 * in case the user refers to the same disk later on. If we fail to 249 * create the pool, we'll be left with a label in this state 250 * which should not be considered part of a valid pool. 251 */ 252 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 253 &pool_guid) != 0 || 254 nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, 255 &vdev_guid) != 0 || 256 nvlist_lookup_uint64(config, ZPOOL_CONFIG_TOP_GUID, 257 &top_guid) != 0 || 258 nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, 259 &txg) != 0 || txg == 0) { 260 nvlist_free(config); 261 return (0); 262 } 263 264 /* 265 * First, see if we know about this pool. If not, then add it to the 266 * list of known pools. 267 */ 268 for (pe = pl->pools; pe != NULL; pe = pe->pe_next) { 269 if (pe->pe_guid == pool_guid) 270 break; 271 } 272 273 if (pe == NULL) { 274 if ((pe = zfs_alloc(hdl, sizeof (pool_entry_t))) == NULL) { 275 nvlist_free(config); 276 return (-1); 277 } 278 pe->pe_guid = pool_guid; 279 pe->pe_next = pl->pools; 280 pl->pools = pe; 281 } 282 283 /* 284 * Second, see if we know about this toplevel vdev. Add it if its 285 * missing. 286 */ 287 for (ve = pe->pe_vdevs; ve != NULL; ve = ve->ve_next) { 288 if (ve->ve_guid == top_guid) 289 break; 290 } 291 292 if (ve == NULL) { 293 if ((ve = zfs_alloc(hdl, sizeof (vdev_entry_t))) == NULL) { 294 nvlist_free(config); 295 return (-1); 296 } 297 ve->ve_guid = top_guid; 298 ve->ve_next = pe->pe_vdevs; 299 pe->pe_vdevs = ve; 300 } 301 302 /* 303 * Third, see if we have a config with a matching transaction group. If 304 * so, then we do nothing. Otherwise, add it to the list of known 305 * configs. 306 */ 307 for (ce = ve->ve_configs; ce != NULL; ce = ce->ce_next) { 308 if (ce->ce_txg == txg) 309 break; 310 } 311 312 if (ce == NULL) { 313 if ((ce = zfs_alloc(hdl, sizeof (config_entry_t))) == NULL) { 314 nvlist_free(config); 315 return (-1); 316 } 317 ce->ce_txg = txg; 318 ce->ce_config = config; 319 ce->ce_next = ve->ve_configs; 320 ve->ve_configs = ce; 321 } else { 322 nvlist_free(config); 323 } 324 325 /* 326 * At this point we've successfully added our config to the list of 327 * known configs. The last thing to do is add the vdev guid -> path 328 * mappings so that we can fix up the configuration as necessary before 329 * doing the import. 330 */ 331 if ((ne = zfs_alloc(hdl, sizeof (name_entry_t))) == NULL) 332 return (-1); 333 334 if ((ne->ne_name = zfs_strdup(hdl, path)) == NULL) { 335 free(ne); 336 return (-1); 337 } 338 339 ne->ne_guid = vdev_guid; 340 ne->ne_next = pl->names; 341 pl->names = ne; 342 343 return (0); 344} 345 346/* 347 * Returns true if the named pool matches the given GUID. 348 */ 349static int 350pool_active(libzfs_handle_t *hdl, const char *name, uint64_t guid, 351 boolean_t *isactive) 352{ 353 zpool_handle_t *zhp; 354 uint64_t theguid; 355 356 if (zpool_open_silent(hdl, name, &zhp) != 0) 357 return (-1); 358 359 if (zhp == NULL) { 360 *isactive = B_FALSE; 361 return (0); 362 } 363 364 verify(nvlist_lookup_uint64(zhp->zpool_config, ZPOOL_CONFIG_POOL_GUID, 365 &theguid) == 0); 366 367 zpool_close(zhp); 368 369 *isactive = (theguid == guid); 370 return (0); 371} 372 373static nvlist_t * 374refresh_config(libzfs_handle_t *hdl, nvlist_t *config) 375{ 376 nvlist_t *nvl; 377 zfs_cmd_t zc = { 0 }; 378 int err; 379 380 if (zcmd_write_conf_nvlist(hdl, &zc, config) != 0) 381 return (NULL); 382 383 if (zcmd_alloc_dst_nvlist(hdl, &zc, 384 zc.zc_nvlist_conf_size * 2) != 0) { 385 zcmd_free_nvlists(&zc); 386 return (NULL); 387 } 388 389 while ((err = ioctl(hdl->libzfs_fd, ZFS_IOC_POOL_TRYIMPORT, 390 &zc)) != 0 && errno == ENOMEM) { 391 if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) { 392 zcmd_free_nvlists(&zc); 393 return (NULL); 394 } 395 } 396 397 if (err) { 398 zcmd_free_nvlists(&zc); 399 return (NULL); 400 } 401 402 if (zcmd_read_dst_nvlist(hdl, &zc, &nvl) != 0) { 403 zcmd_free_nvlists(&zc); 404 return (NULL); 405 } 406 407 zcmd_free_nvlists(&zc); 408 return (nvl); 409} 410 411/* 412 * Determine if the vdev id is a hole in the namespace. 413 */ 414boolean_t 415vdev_is_hole(uint64_t *hole_array, uint_t holes, uint_t id) 416{ 417 for (int c = 0; c < holes; c++) { 418 419 /* Top-level is a hole */ 420 if (hole_array[c] == id) 421 return (B_TRUE); 422 } 423 return (B_FALSE); 424} 425 426/* 427 * Convert our list of pools into the definitive set of configurations. We 428 * start by picking the best config for each toplevel vdev. Once that's done, 429 * we assemble the toplevel vdevs into a full config for the pool. We make a 430 * pass to fix up any incorrect paths, and then add it to the main list to 431 * return to the user. 432 */ 433static nvlist_t * 434get_configs(libzfs_handle_t *hdl, pool_list_t *pl, boolean_t active_ok) 435{ 436 pool_entry_t *pe; 437 vdev_entry_t *ve; 438 config_entry_t *ce; 439 nvlist_t *ret = NULL, *config = NULL, *tmp, *nvtop, *nvroot; 440 nvlist_t **spares, **l2cache; 441 uint_t i, nspares, nl2cache; 442 boolean_t config_seen; 443 uint64_t best_txg; 444 char *name, *hostname; 445 uint64_t guid; 446 uint_t children = 0; 447 nvlist_t **child = NULL; 448 uint_t holes; 449 uint64_t *hole_array, max_id; 450 uint_t c; 451 boolean_t isactive; 452 uint64_t hostid; 453 nvlist_t *nvl; 454 boolean_t found_one = B_FALSE; 455 boolean_t valid_top_config = B_FALSE; 456 457 if (nvlist_alloc(&ret, 0, 0) != 0) 458 goto nomem; 459 460 for (pe = pl->pools; pe != NULL; pe = pe->pe_next) { 461 uint64_t id, max_txg = 0; 462 463 if (nvlist_alloc(&config, NV_UNIQUE_NAME, 0) != 0) 464 goto nomem; 465 config_seen = B_FALSE; 466 467 /* 468 * Iterate over all toplevel vdevs. Grab the pool configuration 469 * from the first one we find, and then go through the rest and 470 * add them as necessary to the 'vdevs' member of the config. 471 */ 472 for (ve = pe->pe_vdevs; ve != NULL; ve = ve->ve_next) { 473 474 /* 475 * Determine the best configuration for this vdev by 476 * selecting the config with the latest transaction 477 * group. 478 */ 479 best_txg = 0; 480 for (ce = ve->ve_configs; ce != NULL; 481 ce = ce->ce_next) { 482 483 if (ce->ce_txg > best_txg) { 484 tmp = ce->ce_config; 485 best_txg = ce->ce_txg; 486 } 487 } 488 489 /* 490 * We rely on the fact that the max txg for the 491 * pool will contain the most up-to-date information 492 * about the valid top-levels in the vdev namespace. 493 */ 494 if (best_txg > max_txg) { 495 (void) nvlist_remove(config, 496 ZPOOL_CONFIG_VDEV_CHILDREN, 497 DATA_TYPE_UINT64); 498 (void) nvlist_remove(config, 499 ZPOOL_CONFIG_HOLE_ARRAY, 500 DATA_TYPE_UINT64_ARRAY); 501 502 max_txg = best_txg; 503 hole_array = NULL; 504 holes = 0; 505 max_id = 0; 506 valid_top_config = B_FALSE; 507 508 if (nvlist_lookup_uint64(tmp, 509 ZPOOL_CONFIG_VDEV_CHILDREN, &max_id) == 0) { 510 verify(nvlist_add_uint64(config, 511 ZPOOL_CONFIG_VDEV_CHILDREN, 512 max_id) == 0); 513 valid_top_config = B_TRUE; 514 } 515 516 if (nvlist_lookup_uint64_array(tmp, 517 ZPOOL_CONFIG_HOLE_ARRAY, &hole_array, 518 &holes) == 0) { 519 verify(nvlist_add_uint64_array(config, 520 ZPOOL_CONFIG_HOLE_ARRAY, 521 hole_array, holes) == 0); 522 } 523 } 524 525 if (!config_seen) { 526 /* 527 * Copy the relevant pieces of data to the pool 528 * configuration: 529 * 530 * version 531 * pool guid 532 * name 533 * comment (if available) 534 * pool state 535 * hostid (if available) 536 * hostname (if available) 537 */ 538 uint64_t state, version; 539 char *comment = NULL; 540 541 version = fnvlist_lookup_uint64(tmp, 542 ZPOOL_CONFIG_VERSION); 543 fnvlist_add_uint64(config, 544 ZPOOL_CONFIG_VERSION, version); 545 guid = fnvlist_lookup_uint64(tmp, 546 ZPOOL_CONFIG_POOL_GUID); 547 fnvlist_add_uint64(config, 548 ZPOOL_CONFIG_POOL_GUID, guid); 549 name = fnvlist_lookup_string(tmp, 550 ZPOOL_CONFIG_POOL_NAME); 551 fnvlist_add_string(config, 552 ZPOOL_CONFIG_POOL_NAME, name); 553 554 if (nvlist_lookup_string(tmp, 555 ZPOOL_CONFIG_COMMENT, &comment) == 0) 556 fnvlist_add_string(config, 557 ZPOOL_CONFIG_COMMENT, comment); 558 559 state = fnvlist_lookup_uint64(tmp, 560 ZPOOL_CONFIG_POOL_STATE); 561 fnvlist_add_uint64(config, 562 ZPOOL_CONFIG_POOL_STATE, state); 563 564 hostid = 0; 565 if (nvlist_lookup_uint64(tmp, 566 ZPOOL_CONFIG_HOSTID, &hostid) == 0) { 567 fnvlist_add_uint64(config, 568 ZPOOL_CONFIG_HOSTID, hostid); 569 hostname = fnvlist_lookup_string(tmp, 570 ZPOOL_CONFIG_HOSTNAME); 571 fnvlist_add_string(config, 572 ZPOOL_CONFIG_HOSTNAME, hostname); 573 } 574 575 config_seen = B_TRUE; 576 } 577 578 /* 579 * Add this top-level vdev to the child array. 580 */ 581 verify(nvlist_lookup_nvlist(tmp, 582 ZPOOL_CONFIG_VDEV_TREE, &nvtop) == 0); 583 verify(nvlist_lookup_uint64(nvtop, ZPOOL_CONFIG_ID, 584 &id) == 0); 585 586 if (id >= children) { 587 nvlist_t **newchild; 588 589 newchild = zfs_alloc(hdl, (id + 1) * 590 sizeof (nvlist_t *)); 591 if (newchild == NULL) 592 goto nomem; 593 594 for (c = 0; c < children; c++) 595 newchild[c] = child[c]; 596 597 free(child); 598 child = newchild; 599 children = id + 1; 600 } 601 if (nvlist_dup(nvtop, &child[id], 0) != 0) 602 goto nomem; 603 604 } 605 606 /* 607 * If we have information about all the top-levels then 608 * clean up the nvlist which we've constructed. This 609 * means removing any extraneous devices that are 610 * beyond the valid range or adding devices to the end 611 * of our array which appear to be missing. 612 */ 613 if (valid_top_config) { 614 if (max_id < children) { 615 for (c = max_id; c < children; c++) 616 nvlist_free(child[c]); 617 children = max_id; 618 } else if (max_id > children) { 619 nvlist_t **newchild; 620 621 newchild = zfs_alloc(hdl, (max_id) * 622 sizeof (nvlist_t *)); 623 if (newchild == NULL) 624 goto nomem; 625 626 for (c = 0; c < children; c++) 627 newchild[c] = child[c]; 628 629 free(child); 630 child = newchild; 631 children = max_id; 632 } 633 } 634 635 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 636 &guid) == 0); 637 638 /* 639 * The vdev namespace may contain holes as a result of 640 * device removal. We must add them back into the vdev 641 * tree before we process any missing devices. 642 */ 643 if (holes > 0) { 644 ASSERT(valid_top_config); 645 646 for (c = 0; c < children; c++) { 647 nvlist_t *holey; 648 649 if (child[c] != NULL || 650 !vdev_is_hole(hole_array, holes, c)) 651 continue; 652 653 if (nvlist_alloc(&holey, NV_UNIQUE_NAME, 654 0) != 0) 655 goto nomem; 656 657 /* 658 * Holes in the namespace are treated as 659 * "hole" top-level vdevs and have a 660 * special flag set on them. 661 */ 662 if (nvlist_add_string(holey, 663 ZPOOL_CONFIG_TYPE, 664 VDEV_TYPE_HOLE) != 0 || 665 nvlist_add_uint64(holey, 666 ZPOOL_CONFIG_ID, c) != 0 || 667 nvlist_add_uint64(holey, 668 ZPOOL_CONFIG_GUID, 0ULL) != 0) 669 goto nomem; 670 child[c] = holey; 671 } 672 } 673 674 /* 675 * Look for any missing top-level vdevs. If this is the case, 676 * create a faked up 'missing' vdev as a placeholder. We cannot 677 * simply compress the child array, because the kernel performs 678 * certain checks to make sure the vdev IDs match their location 679 * in the configuration. 680 */ 681 for (c = 0; c < children; c++) { 682 if (child[c] == NULL) { 683 nvlist_t *missing; 684 if (nvlist_alloc(&missing, NV_UNIQUE_NAME, 685 0) != 0) 686 goto nomem; 687 if (nvlist_add_string(missing, 688 ZPOOL_CONFIG_TYPE, 689 VDEV_TYPE_MISSING) != 0 || 690 nvlist_add_uint64(missing, 691 ZPOOL_CONFIG_ID, c) != 0 || 692 nvlist_add_uint64(missing, 693 ZPOOL_CONFIG_GUID, 0ULL) != 0) { 694 nvlist_free(missing); 695 goto nomem; 696 } 697 child[c] = missing; 698 } 699 } 700 701 /* 702 * Put all of this pool's top-level vdevs into a root vdev. 703 */ 704 if (nvlist_alloc(&nvroot, NV_UNIQUE_NAME, 0) != 0) 705 goto nomem; 706 if (nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, 707 VDEV_TYPE_ROOT) != 0 || 708 nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) != 0 || 709 nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, guid) != 0 || 710 nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, 711 child, children) != 0) { 712 nvlist_free(nvroot); 713 goto nomem; 714 } 715 716 for (c = 0; c < children; c++) 717 nvlist_free(child[c]); 718 free(child); 719 children = 0; 720 child = NULL; 721 722 /* 723 * Go through and fix up any paths and/or devids based on our 724 * known list of vdev GUID -> path mappings. 725 */ 726 if (fix_paths(nvroot, pl->names) != 0) { 727 nvlist_free(nvroot); 728 goto nomem; 729 } 730 731 /* 732 * Add the root vdev to this pool's configuration. 733 */ 734 if (nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 735 nvroot) != 0) { 736 nvlist_free(nvroot); 737 goto nomem; 738 } 739 nvlist_free(nvroot); 740 741 /* 742 * zdb uses this path to report on active pools that were 743 * imported or created using -R. 744 */ 745 if (active_ok) 746 goto add_pool; 747 748 /* 749 * Determine if this pool is currently active, in which case we 750 * can't actually import it. 751 */ 752 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 753 &name) == 0); 754 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 755 &guid) == 0); 756 757 if (pool_active(hdl, name, guid, &isactive) != 0) 758 goto error; 759 760 if (isactive) { 761 nvlist_free(config); 762 config = NULL; 763 continue; 764 } 765 766 if ((nvl = refresh_config(hdl, config)) == NULL) { 767 nvlist_free(config); 768 config = NULL; 769 continue; 770 } 771 772 nvlist_free(config); 773 config = nvl; 774 775 /* 776 * Go through and update the paths for spares, now that we have 777 * them. 778 */ 779 verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 780 &nvroot) == 0); 781 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 782 &spares, &nspares) == 0) { 783 for (i = 0; i < nspares; i++) { 784 if (fix_paths(spares[i], pl->names) != 0) 785 goto nomem; 786 } 787 } 788 789 /* 790 * Update the paths for l2cache devices. 791 */ 792 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 793 &l2cache, &nl2cache) == 0) { 794 for (i = 0; i < nl2cache; i++) { 795 if (fix_paths(l2cache[i], pl->names) != 0) 796 goto nomem; 797 } 798 } 799 800 /* 801 * Restore the original information read from the actual label. 802 */ 803 (void) nvlist_remove(config, ZPOOL_CONFIG_HOSTID, 804 DATA_TYPE_UINT64); 805 (void) nvlist_remove(config, ZPOOL_CONFIG_HOSTNAME, 806 DATA_TYPE_STRING); 807 if (hostid != 0) { 808 verify(nvlist_add_uint64(config, ZPOOL_CONFIG_HOSTID, 809 hostid) == 0); 810 verify(nvlist_add_string(config, ZPOOL_CONFIG_HOSTNAME, 811 hostname) == 0); 812 } 813 814add_pool: 815 /* 816 * Add this pool to the list of configs. 817 */ 818 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 819 &name) == 0); 820 if (nvlist_add_nvlist(ret, name, config) != 0) 821 goto nomem; 822 823 found_one = B_TRUE; 824 nvlist_free(config); 825 config = NULL; 826 } 827 828 if (!found_one) { 829 nvlist_free(ret); 830 ret = NULL; 831 } 832 833 return (ret); 834 835nomem: 836 (void) no_memory(hdl); 837error: 838 nvlist_free(config); 839 nvlist_free(ret); 840 for (c = 0; c < children; c++) 841 nvlist_free(child[c]); 842 free(child); 843 844 return (NULL); 845} 846 847/* 848 * Return the offset of the given label. 849 */ 850static uint64_t 851label_offset(uint64_t size, int l) 852{ 853 ASSERT(P2PHASE_TYPED(size, sizeof (vdev_label_t), uint64_t) == 0); 854 return (l * sizeof (vdev_label_t) + (l < VDEV_LABELS / 2 ? 855 0 : size - VDEV_LABELS * sizeof (vdev_label_t))); 856} 857 858/* 859 * Given a file descriptor, read the label information and return an nvlist 860 * describing the configuration, if there is one. 861 */ 862int 863zpool_read_label(int fd, nvlist_t **config) 864{ 865 struct stat64 statbuf; 866 int l; 867 vdev_label_t *label; 868 uint64_t state, txg, size; 869 870 *config = NULL; 871 872 if (fstat64(fd, &statbuf) == -1) 873 return (0); 874 size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t); 875 876 if ((label = malloc(sizeof (vdev_label_t))) == NULL) 877 return (-1); 878 879 for (l = 0; l < VDEV_LABELS; l++) { 880 if (pread64(fd, label, sizeof (vdev_label_t), 881 label_offset(size, l)) != sizeof (vdev_label_t)) 882 continue; 883 884 if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist, 885 sizeof (label->vl_vdev_phys.vp_nvlist), config, 0) != 0) 886 continue; 887 888 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE, 889 &state) != 0 || state > POOL_STATE_L2CACHE) { 890 nvlist_free(*config); 891 continue; 892 } 893 894 if (state != POOL_STATE_SPARE && state != POOL_STATE_L2CACHE && 895 (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG, 896 &txg) != 0 || txg == 0)) { 897 nvlist_free(*config); 898 continue; 899 } 900 901 free(label); 902 return (0); 903 } 904 905 free(label); 906 *config = NULL; 907 return (0); 908} 909 910typedef struct rdsk_node { 911 char *rn_name; 912 int rn_dfd; 913 libzfs_handle_t *rn_hdl; 914 nvlist_t *rn_config; 915 avl_tree_t *rn_avl; 916 avl_node_t rn_node; 917 boolean_t rn_nozpool; 918} rdsk_node_t; 919 920static int 921slice_cache_compare(const void *arg1, const void *arg2) 922{ 923 const char *nm1 = ((rdsk_node_t *)arg1)->rn_name; 924 const char *nm2 = ((rdsk_node_t *)arg2)->rn_name; 925 char *nm1slice, *nm2slice; 926 int rv; 927 928 /* 929 * slices zero and two are the most likely to provide results, 930 * so put those first 931 */ 932 nm1slice = strstr(nm1, "s0"); 933 nm2slice = strstr(nm2, "s0"); 934 if (nm1slice && !nm2slice) { 935 return (-1); 936 } 937 if (!nm1slice && nm2slice) { 938 return (1); 939 } 940 nm1slice = strstr(nm1, "s2"); 941 nm2slice = strstr(nm2, "s2"); 942 if (nm1slice && !nm2slice) { 943 return (-1); 944 } 945 if (!nm1slice && nm2slice) { 946 return (1); 947 } 948 949 rv = strcmp(nm1, nm2); 950 if (rv == 0) 951 return (0); 952 return (rv > 0 ? 1 : -1); 953} 954 955#ifdef sun 956static void 957check_one_slice(avl_tree_t *r, char *diskname, uint_t partno, 958 diskaddr_t size, uint_t blksz) 959{ 960 rdsk_node_t tmpnode; 961 rdsk_node_t *node; 962 char sname[MAXNAMELEN]; 963 964 tmpnode.rn_name = &sname[0]; 965 (void) snprintf(tmpnode.rn_name, MAXNAMELEN, "%s%u", 966 diskname, partno); 967 /* 968 * protect against division by zero for disk labels that 969 * contain a bogus sector size 970 */ 971 if (blksz == 0) 972 blksz = DEV_BSIZE; 973 /* too small to contain a zpool? */ 974 if ((size < (SPA_MINDEVSIZE / blksz)) && 975 (node = avl_find(r, &tmpnode, NULL))) 976 node->rn_nozpool = B_TRUE; 977} 978#endif /* sun */ 979 980static void 981nozpool_all_slices(avl_tree_t *r, const char *sname) 982{ 983#ifdef sun 984 char diskname[MAXNAMELEN]; 985 char *ptr; 986 int i; 987 988 (void) strncpy(diskname, sname, MAXNAMELEN); 989 if (((ptr = strrchr(diskname, 's')) == NULL) && 990 ((ptr = strrchr(diskname, 'p')) == NULL)) 991 return; 992 ptr[0] = 's'; 993 ptr[1] = '\0'; 994 for (i = 0; i < NDKMAP; i++) 995 check_one_slice(r, diskname, i, 0, 1); 996 ptr[0] = 'p'; 997 for (i = 0; i <= FD_NUMPART; i++) 998 check_one_slice(r, diskname, i, 0, 1); 999#endif /* sun */ 1000} 1001 1002#ifdef sun 1003static void 1004check_slices(avl_tree_t *r, int fd, const char *sname) 1005{ 1006 struct extvtoc vtoc; 1007 struct dk_gpt *gpt; 1008 char diskname[MAXNAMELEN]; 1009 char *ptr; 1010 int i; 1011 1012 (void) strncpy(diskname, sname, MAXNAMELEN); 1013 if ((ptr = strrchr(diskname, 's')) == NULL || !isdigit(ptr[1])) 1014 return; 1015 ptr[1] = '\0'; 1016 1017 if (read_extvtoc(fd, &vtoc) >= 0) { 1018 for (i = 0; i < NDKMAP; i++) 1019 check_one_slice(r, diskname, i, 1020 vtoc.v_part[i].p_size, vtoc.v_sectorsz); 1021 } else if (efi_alloc_and_read(fd, &gpt) >= 0) { 1022 /* 1023 * on x86 we'll still have leftover links that point 1024 * to slices s[9-15], so use NDKMAP instead 1025 */ 1026 for (i = 0; i < NDKMAP; i++) 1027 check_one_slice(r, diskname, i, 1028 gpt->efi_parts[i].p_size, gpt->efi_lbasize); 1029 /* nodes p[1-4] are never used with EFI labels */ 1030 ptr[0] = 'p'; 1031 for (i = 1; i <= FD_NUMPART; i++) 1032 check_one_slice(r, diskname, i, 0, 1); 1033 efi_free(gpt); 1034 } 1035} 1036#endif /* sun */ 1037 1038static void 1039zpool_open_func(void *arg) 1040{ 1041 rdsk_node_t *rn = arg; 1042 struct stat64 statbuf; 1043 nvlist_t *config; 1044 int fd; 1045 1046 if (rn->rn_nozpool) 1047 return; 1048 if ((fd = openat64(rn->rn_dfd, rn->rn_name, O_RDONLY)) < 0) { 1049 /* symlink to a device that's no longer there */ 1050 if (errno == ENOENT) 1051 nozpool_all_slices(rn->rn_avl, rn->rn_name); 1052 return; 1053 } 1054 /* 1055 * Ignore failed stats. We only want regular 1056 * files, character devs and block devs. 1057 */ 1058 if (fstat64(fd, &statbuf) != 0 || 1059 (!S_ISREG(statbuf.st_mode) && 1060 !S_ISCHR(statbuf.st_mode) && 1061 !S_ISBLK(statbuf.st_mode))) { 1062 (void) close(fd); 1063 return; 1064 } 1065 /* this file is too small to hold a zpool */ 1066#ifdef sun 1067 if (S_ISREG(statbuf.st_mode) && 1068 statbuf.st_size < SPA_MINDEVSIZE) { 1069 (void) close(fd); 1070 return; 1071 } else if (!S_ISREG(statbuf.st_mode)) { 1072 /* 1073 * Try to read the disk label first so we don't have to 1074 * open a bunch of minor nodes that can't have a zpool. 1075 */ 1076 check_slices(rn->rn_avl, fd, rn->rn_name); 1077 } 1078#else /* !sun */ 1079 if (statbuf.st_size < SPA_MINDEVSIZE) { 1080 (void) close(fd); 1081 return; 1082 } 1083#endif /* sun */ 1084 1085 if ((zpool_read_label(fd, &config)) != 0) { 1086 (void) close(fd); 1087 (void) no_memory(rn->rn_hdl); 1088 return; 1089 } 1090 (void) close(fd); 1091 1092 1093 rn->rn_config = config; 1094 if (config != NULL) { 1095 assert(rn->rn_nozpool == B_FALSE); 1096 } 1097} 1098 1099/* 1100 * Given a file descriptor, clear (zero) the label information. This function 1101 * is used in the appliance stack as part of the ZFS sysevent module and 1102 * to implement the "zpool labelclear" command. 1103 */ 1104int 1105zpool_clear_label(int fd) 1106{ 1107 struct stat64 statbuf; 1108 int l; 1109 vdev_label_t *label; 1110 uint64_t size; 1111 1112 if (fstat64(fd, &statbuf) == -1) 1113 return (0); 1114 size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t); 1115 1116 if ((label = calloc(sizeof (vdev_label_t), 1)) == NULL) 1117 return (-1); 1118 1119 for (l = 0; l < VDEV_LABELS; l++) { 1120 if (pwrite64(fd, label, sizeof (vdev_label_t), 1121 label_offset(size, l)) != sizeof (vdev_label_t)) 1122 return (-1); 1123 } 1124 1125 free(label); 1126 return (0); 1127} 1128 1129/* 1130 * Given a list of directories to search, find all pools stored on disk. This 1131 * includes partial pools which are not available to import. If no args are 1132 * given (argc is 0), then the default directory (/dev/dsk) is searched. 1133 * poolname or guid (but not both) are provided by the caller when trying 1134 * to import a specific pool. 1135 */ 1136static nvlist_t * 1137zpool_find_import_impl(libzfs_handle_t *hdl, importargs_t *iarg) 1138{ 1139 int i, dirs = iarg->paths; 1140 DIR *dirp = NULL; 1141 struct dirent64 *dp; 1142 char path[MAXPATHLEN]; 1143 char *end, **dir = iarg->path; 1144 size_t pathleft; 1145 nvlist_t *ret = NULL; 1146 static char *default_dir = "/dev"; 1147 pool_list_t pools = { 0 }; 1148 pool_entry_t *pe, *penext; 1149 vdev_entry_t *ve, *venext; 1150 config_entry_t *ce, *cenext; 1151 name_entry_t *ne, *nenext; 1152 avl_tree_t slice_cache; 1153 rdsk_node_t *slice; 1154 void *cookie; 1155 1156 if (dirs == 0) { 1157 dirs = 1; 1158 dir = &default_dir; 1159 } 1160 1161 /* 1162 * Go through and read the label configuration information from every 1163 * possible device, organizing the information according to pool GUID 1164 * and toplevel GUID. 1165 */ 1166 for (i = 0; i < dirs; i++) { 1167 tpool_t *t; 1168 char *rdsk; 1169 int dfd; 1170 1171 /* use realpath to normalize the path */ 1172 if (realpath(dir[i], path) == 0) { 1173 (void) zfs_error_fmt(hdl, EZFS_BADPATH, 1174 dgettext(TEXT_DOMAIN, "cannot open '%s'"), dir[i]); 1175 goto error; 1176 } 1177 end = &path[strlen(path)]; 1178 *end++ = '/'; 1179 *end = 0; 1180 pathleft = &path[sizeof (path)] - end; 1181 1182 /* 1183 * Using raw devices instead of block devices when we're 1184 * reading the labels skips a bunch of slow operations during 1185 * close(2) processing, so we replace /dev/dsk with /dev/rdsk. 1186 */ 1187 if (strcmp(path, "/dev/dsk/") == 0) 1188 rdsk = "/dev/"; 1189 else 1190 rdsk = path; 1191 1192 if ((dfd = open64(rdsk, O_RDONLY)) < 0 || 1193 (dirp = fdopendir(dfd)) == NULL) { 1194 zfs_error_aux(hdl, strerror(errno)); 1195 (void) zfs_error_fmt(hdl, EZFS_BADPATH, 1196 dgettext(TEXT_DOMAIN, "cannot open '%s'"), 1197 rdsk); 1198 goto error; 1199 } 1200 1201 avl_create(&slice_cache, slice_cache_compare, 1202 sizeof (rdsk_node_t), offsetof(rdsk_node_t, rn_node)); 1203 1204 if (strcmp(rdsk, "/dev/") == 0) { 1205 struct gmesh mesh; 1206 struct gclass *mp; 1207 struct ggeom *gp; 1208 struct gprovider *pp; 1209 1210 errno = geom_gettree(&mesh); 1211 if (errno != 0) { 1212 zfs_error_aux(hdl, strerror(errno)); 1213 (void) zfs_error_fmt(hdl, EZFS_BADPATH, 1214 dgettext(TEXT_DOMAIN, "cannot get GEOM tree")); 1215 goto error; 1216 } 1217 1218 LIST_FOREACH(mp, &mesh.lg_class, lg_class) { 1219 LIST_FOREACH(gp, &mp->lg_geom, lg_geom) { 1220 LIST_FOREACH(pp, &gp->lg_provider, lg_provider) { 1221 slice = zfs_alloc(hdl, sizeof (rdsk_node_t)); 1222 slice->rn_name = zfs_strdup(hdl, pp->lg_name); 1223 slice->rn_avl = &slice_cache; 1224 slice->rn_dfd = dfd; 1225 slice->rn_hdl = hdl; 1226 slice->rn_nozpool = B_FALSE; 1227 avl_add(&slice_cache, slice); 1228 } 1229 } 1230 } 1231 1232 geom_deletetree(&mesh); 1233 goto skipdir; 1234 } 1235 1236 /* 1237 * This is not MT-safe, but we have no MT consumers of libzfs 1238 */ 1239 while ((dp = readdir64(dirp)) != NULL) { 1240 const char *name = dp->d_name; 1241 if (name[0] == '.' && 1242 (name[1] == 0 || (name[1] == '.' && name[2] == 0))) 1243 continue; 1244 1245 slice = zfs_alloc(hdl, sizeof (rdsk_node_t)); 1246 slice->rn_name = zfs_strdup(hdl, name); 1247 slice->rn_avl = &slice_cache; 1248 slice->rn_dfd = dfd; 1249 slice->rn_hdl = hdl; 1250 slice->rn_nozpool = B_FALSE; 1251 avl_add(&slice_cache, slice); 1252 } 1253skipdir: 1254 /* 1255 * create a thread pool to do all of this in parallel; 1256 * rn_nozpool is not protected, so this is racy in that 1257 * multiple tasks could decide that the same slice can 1258 * not hold a zpool, which is benign. Also choose 1259 * double the number of processors; we hold a lot of 1260 * locks in the kernel, so going beyond this doesn't 1261 * buy us much. 1262 */ 1263 t = tpool_create(1, 2 * sysconf(_SC_NPROCESSORS_ONLN), 1264 0, NULL); 1265 for (slice = avl_first(&slice_cache); slice; 1266 (slice = avl_walk(&slice_cache, slice, 1267 AVL_AFTER))) 1268 (void) tpool_dispatch(t, zpool_open_func, slice); 1269 tpool_wait(t); 1270 tpool_destroy(t); 1271 1272 cookie = NULL; 1273 while ((slice = avl_destroy_nodes(&slice_cache, 1274 &cookie)) != NULL) { 1275 if (slice->rn_config != NULL) { 1276 nvlist_t *config = slice->rn_config; 1277 boolean_t matched = B_TRUE; 1278 1279 if (iarg->poolname != NULL) { 1280 char *pname; 1281 1282 matched = nvlist_lookup_string(config, 1283 ZPOOL_CONFIG_POOL_NAME, 1284 &pname) == 0 && 1285 strcmp(iarg->poolname, pname) == 0; 1286 } else if (iarg->guid != 0) { 1287 uint64_t this_guid; 1288 1289 matched = nvlist_lookup_uint64(config, 1290 ZPOOL_CONFIG_POOL_GUID, 1291 &this_guid) == 0 && 1292 iarg->guid == this_guid; 1293 } 1294 if (!matched) { 1295 nvlist_free(config); 1296 config = NULL; 1297 continue; 1298 } 1299 /* use the non-raw path for the config */ 1300 (void) strlcpy(end, slice->rn_name, pathleft); 1301 if (add_config(hdl, &pools, path, config) != 0) 1302 goto error; 1303 } 1304 free(slice->rn_name); 1305 free(slice); 1306 } 1307 avl_destroy(&slice_cache); 1308 1309 (void) closedir(dirp); 1310 dirp = NULL; 1311 } 1312 1313 ret = get_configs(hdl, &pools, iarg->can_be_active); 1314 1315error: 1316 for (pe = pools.pools; pe != NULL; pe = penext) { 1317 penext = pe->pe_next; 1318 for (ve = pe->pe_vdevs; ve != NULL; ve = venext) { 1319 venext = ve->ve_next; 1320 for (ce = ve->ve_configs; ce != NULL; ce = cenext) { 1321 cenext = ce->ce_next; 1322 if (ce->ce_config) 1323 nvlist_free(ce->ce_config); 1324 free(ce); 1325 } 1326 free(ve); 1327 } 1328 free(pe); 1329 } 1330 1331 for (ne = pools.names; ne != NULL; ne = nenext) { 1332 nenext = ne->ne_next; 1333 if (ne->ne_name) 1334 free(ne->ne_name); 1335 free(ne); 1336 } 1337 1338 if (dirp) 1339 (void) closedir(dirp); 1340 1341 return (ret); 1342} 1343 1344nvlist_t * 1345zpool_find_import(libzfs_handle_t *hdl, int argc, char **argv) 1346{ 1347 importargs_t iarg = { 0 }; 1348 1349 iarg.paths = argc; 1350 iarg.path = argv; 1351 1352 return (zpool_find_import_impl(hdl, &iarg)); 1353} 1354 1355/* 1356 * Given a cache file, return the contents as a list of importable pools. 1357 * poolname or guid (but not both) are provided by the caller when trying 1358 * to import a specific pool. 1359 */ 1360nvlist_t * 1361zpool_find_import_cached(libzfs_handle_t *hdl, const char *cachefile, 1362 char *poolname, uint64_t guid) 1363{ 1364 char *buf; 1365 int fd; 1366 struct stat64 statbuf; 1367 nvlist_t *raw, *src, *dst; 1368 nvlist_t *pools; 1369 nvpair_t *elem; 1370 char *name; 1371 uint64_t this_guid; 1372 boolean_t active; 1373 1374 verify(poolname == NULL || guid == 0); 1375 1376 if ((fd = open(cachefile, O_RDONLY)) < 0) { 1377 zfs_error_aux(hdl, "%s", strerror(errno)); 1378 (void) zfs_error(hdl, EZFS_BADCACHE, 1379 dgettext(TEXT_DOMAIN, "failed to open cache file")); 1380 return (NULL); 1381 } 1382 1383 if (fstat64(fd, &statbuf) != 0) { 1384 zfs_error_aux(hdl, "%s", strerror(errno)); 1385 (void) close(fd); 1386 (void) zfs_error(hdl, EZFS_BADCACHE, 1387 dgettext(TEXT_DOMAIN, "failed to get size of cache file")); 1388 return (NULL); 1389 } 1390 1391 if ((buf = zfs_alloc(hdl, statbuf.st_size)) == NULL) { 1392 (void) close(fd); 1393 return (NULL); 1394 } 1395 1396 if (read(fd, buf, statbuf.st_size) != statbuf.st_size) { 1397 (void) close(fd); 1398 free(buf); 1399 (void) zfs_error(hdl, EZFS_BADCACHE, 1400 dgettext(TEXT_DOMAIN, 1401 "failed to read cache file contents")); 1402 return (NULL); 1403 } 1404 1405 (void) close(fd); 1406 1407 if (nvlist_unpack(buf, statbuf.st_size, &raw, 0) != 0) { 1408 free(buf); 1409 (void) zfs_error(hdl, EZFS_BADCACHE, 1410 dgettext(TEXT_DOMAIN, 1411 "invalid or corrupt cache file contents")); 1412 return (NULL); 1413 } 1414 1415 free(buf); 1416 1417 /* 1418 * Go through and get the current state of the pools and refresh their 1419 * state. 1420 */ 1421 if (nvlist_alloc(&pools, 0, 0) != 0) { 1422 (void) no_memory(hdl); 1423 nvlist_free(raw); 1424 return (NULL); 1425 } 1426 1427 elem = NULL; 1428 while ((elem = nvlist_next_nvpair(raw, elem)) != NULL) { 1429 src = fnvpair_value_nvlist(elem); 1430 1431 name = fnvlist_lookup_string(src, ZPOOL_CONFIG_POOL_NAME); 1432 if (poolname != NULL && strcmp(poolname, name) != 0) 1433 continue; 1434 1435 this_guid = fnvlist_lookup_uint64(src, ZPOOL_CONFIG_POOL_GUID); 1436 if (guid != 0 && guid != this_guid) 1437 continue; 1438 1439 if (pool_active(hdl, name, this_guid, &active) != 0) { 1440 nvlist_free(raw); 1441 nvlist_free(pools); 1442 return (NULL); 1443 } 1444 1445 if (active) 1446 continue; 1447 1448 if ((dst = refresh_config(hdl, src)) == NULL) { 1449 nvlist_free(raw); 1450 nvlist_free(pools); 1451 return (NULL); 1452 } 1453 1454 if (nvlist_add_nvlist(pools, nvpair_name(elem), dst) != 0) { 1455 (void) no_memory(hdl); 1456 nvlist_free(dst); 1457 nvlist_free(raw); 1458 nvlist_free(pools); 1459 return (NULL); 1460 } 1461 nvlist_free(dst); 1462 } 1463 1464 nvlist_free(raw); 1465 return (pools); 1466} 1467 1468static int 1469name_or_guid_exists(zpool_handle_t *zhp, void *data) 1470{ 1471 importargs_t *import = data; 1472 int found = 0; 1473 1474 if (import->poolname != NULL) { 1475 char *pool_name; 1476 1477 verify(nvlist_lookup_string(zhp->zpool_config, 1478 ZPOOL_CONFIG_POOL_NAME, &pool_name) == 0); 1479 if (strcmp(pool_name, import->poolname) == 0) 1480 found = 1; 1481 } else { 1482 uint64_t pool_guid; 1483 1484 verify(nvlist_lookup_uint64(zhp->zpool_config, 1485 ZPOOL_CONFIG_POOL_GUID, &pool_guid) == 0); 1486 if (pool_guid == import->guid) 1487 found = 1; 1488 } 1489 1490 zpool_close(zhp); 1491 return (found); 1492} 1493 1494nvlist_t * 1495zpool_search_import(libzfs_handle_t *hdl, importargs_t *import) 1496{ 1497 verify(import->poolname == NULL || import->guid == 0); 1498 1499 if (import->unique) 1500 import->exists = zpool_iter(hdl, name_or_guid_exists, import); 1501 1502 if (import->cachefile != NULL) 1503 return (zpool_find_import_cached(hdl, import->cachefile, 1504 import->poolname, import->guid)); 1505 1506 return (zpool_find_import_impl(hdl, import)); 1507} 1508 1509boolean_t 1510find_guid(nvlist_t *nv, uint64_t guid) 1511{ 1512 uint64_t tmp; 1513 nvlist_t **child; 1514 uint_t c, children; 1515 1516 verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &tmp) == 0); 1517 if (tmp == guid) 1518 return (B_TRUE); 1519 1520 if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, 1521 &child, &children) == 0) { 1522 for (c = 0; c < children; c++) 1523 if (find_guid(child[c], guid)) 1524 return (B_TRUE); 1525 } 1526 1527 return (B_FALSE); 1528} 1529 1530typedef struct aux_cbdata { 1531 const char *cb_type; 1532 uint64_t cb_guid; 1533 zpool_handle_t *cb_zhp; 1534} aux_cbdata_t; 1535 1536static int 1537find_aux(zpool_handle_t *zhp, void *data) 1538{ 1539 aux_cbdata_t *cbp = data; 1540 nvlist_t **list; 1541 uint_t i, count; 1542 uint64_t guid; 1543 nvlist_t *nvroot; 1544 1545 verify(nvlist_lookup_nvlist(zhp->zpool_config, ZPOOL_CONFIG_VDEV_TREE, 1546 &nvroot) == 0); 1547 1548 if (nvlist_lookup_nvlist_array(nvroot, cbp->cb_type, 1549 &list, &count) == 0) { 1550 for (i = 0; i < count; i++) { 1551 verify(nvlist_lookup_uint64(list[i], 1552 ZPOOL_CONFIG_GUID, &guid) == 0); 1553 if (guid == cbp->cb_guid) { 1554 cbp->cb_zhp = zhp; 1555 return (1); 1556 } 1557 } 1558 } 1559 1560 zpool_close(zhp); 1561 return (0); 1562} 1563 1564/* 1565 * Determines if the pool is in use. If so, it returns true and the state of 1566 * the pool as well as the name of the pool. Both strings are allocated and 1567 * must be freed by the caller. 1568 */ 1569int 1570zpool_in_use(libzfs_handle_t *hdl, int fd, pool_state_t *state, char **namestr, 1571 boolean_t *inuse) 1572{ 1573 nvlist_t *config; 1574 char *name; 1575 boolean_t ret; 1576 uint64_t guid, vdev_guid; 1577 zpool_handle_t *zhp; 1578 nvlist_t *pool_config; 1579 uint64_t stateval, isspare; 1580 aux_cbdata_t cb = { 0 }; 1581 boolean_t isactive; 1582 1583 *inuse = B_FALSE; 1584 1585 if (zpool_read_label(fd, &config) != 0) { 1586 (void) no_memory(hdl); 1587 return (-1); 1588 } 1589 1590 if (config == NULL) 1591 return (0); 1592 1593 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE, 1594 &stateval) == 0); 1595 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, 1596 &vdev_guid) == 0); 1597 1598 if (stateval != POOL_STATE_SPARE && stateval != POOL_STATE_L2CACHE) { 1599 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 1600 &name) == 0); 1601 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 1602 &guid) == 0); 1603 } 1604 1605 switch (stateval) { 1606 case POOL_STATE_EXPORTED: 1607 /* 1608 * A pool with an exported state may in fact be imported 1609 * read-only, so check the in-core state to see if it's 1610 * active and imported read-only. If it is, set 1611 * its state to active. 1612 */ 1613 if (pool_active(hdl, name, guid, &isactive) == 0 && isactive && 1614 (zhp = zpool_open_canfail(hdl, name)) != NULL) { 1615 if (zpool_get_prop_int(zhp, ZPOOL_PROP_READONLY, NULL)) 1616 stateval = POOL_STATE_ACTIVE; 1617 1618 /* 1619 * All we needed the zpool handle for is the 1620 * readonly prop check. 1621 */ 1622 zpool_close(zhp); 1623 } 1624 1625 ret = B_TRUE; 1626 break; 1627 1628 case POOL_STATE_ACTIVE: 1629 /* 1630 * For an active pool, we have to determine if it's really part 1631 * of a currently active pool (in which case the pool will exist 1632 * and the guid will be the same), or whether it's part of an 1633 * active pool that was disconnected without being explicitly 1634 * exported. 1635 */ 1636 if (pool_active(hdl, name, guid, &isactive) != 0) { 1637 nvlist_free(config); 1638 return (-1); 1639 } 1640 1641 if (isactive) { 1642 /* 1643 * Because the device may have been removed while 1644 * offlined, we only report it as active if the vdev is 1645 * still present in the config. Otherwise, pretend like 1646 * it's not in use. 1647 */ 1648 if ((zhp = zpool_open_canfail(hdl, name)) != NULL && 1649 (pool_config = zpool_get_config(zhp, NULL)) 1650 != NULL) { 1651 nvlist_t *nvroot; 1652 1653 verify(nvlist_lookup_nvlist(pool_config, 1654 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 1655 ret = find_guid(nvroot, vdev_guid); 1656 } else { 1657 ret = B_FALSE; 1658 } 1659 1660 /* 1661 * If this is an active spare within another pool, we 1662 * treat it like an unused hot spare. This allows the 1663 * user to create a pool with a hot spare that currently 1664 * in use within another pool. Since we return B_TRUE, 1665 * libdiskmgt will continue to prevent generic consumers 1666 * from using the device. 1667 */ 1668 if (ret && nvlist_lookup_uint64(config, 1669 ZPOOL_CONFIG_IS_SPARE, &isspare) == 0 && isspare) 1670 stateval = POOL_STATE_SPARE; 1671 1672 if (zhp != NULL) 1673 zpool_close(zhp); 1674 } else { 1675 stateval = POOL_STATE_POTENTIALLY_ACTIVE; 1676 ret = B_TRUE; 1677 } 1678 break; 1679 1680 case POOL_STATE_SPARE: 1681 /* 1682 * For a hot spare, it can be either definitively in use, or 1683 * potentially active. To determine if it's in use, we iterate 1684 * over all pools in the system and search for one with a spare 1685 * with a matching guid. 1686 * 1687 * Due to the shared nature of spares, we don't actually report 1688 * the potentially active case as in use. This means the user 1689 * can freely create pools on the hot spares of exported pools, 1690 * but to do otherwise makes the resulting code complicated, and 1691 * we end up having to deal with this case anyway. 1692 */ 1693 cb.cb_zhp = NULL; 1694 cb.cb_guid = vdev_guid; 1695 cb.cb_type = ZPOOL_CONFIG_SPARES; 1696 if (zpool_iter(hdl, find_aux, &cb) == 1) { 1697 name = (char *)zpool_get_name(cb.cb_zhp); 1698 ret = TRUE; 1699 } else { 1700 ret = FALSE; 1701 } 1702 break; 1703 1704 case POOL_STATE_L2CACHE: 1705 1706 /* 1707 * Check if any pool is currently using this l2cache device. 1708 */ 1709 cb.cb_zhp = NULL; 1710 cb.cb_guid = vdev_guid; 1711 cb.cb_type = ZPOOL_CONFIG_L2CACHE; 1712 if (zpool_iter(hdl, find_aux, &cb) == 1) { 1713 name = (char *)zpool_get_name(cb.cb_zhp); 1714 ret = TRUE; 1715 } else { 1716 ret = FALSE; 1717 } 1718 break; 1719 1720 default: 1721 ret = B_FALSE; 1722 } 1723 1724 1725 if (ret) { 1726 if ((*namestr = zfs_strdup(hdl, name)) == NULL) { 1727 if (cb.cb_zhp) 1728 zpool_close(cb.cb_zhp); 1729 nvlist_free(config); 1730 return (-1); 1731 } 1732 *state = (pool_state_t)stateval; 1733 } 1734 1735 if (cb.cb_zhp) 1736 zpool_close(cb.cb_zhp); 1737 1738 nvlist_free(config); 1739 *inuse = ret; 1740 return (0); 1741} 1742